REM Subgroup 5: Crust and Lithosphere

Latest Updates

• a new global compilation of heatflow data now available (march 2001)
• a global crustal model CRUST2.0 at 2x2 degrees now available (march 2001)
• a CRUST1.0, global crustal model at 1x1 degrees now available (july 2013)
  this model SUPERSEDES CRUST2.0!

This page provides introductions and links for maps and models of the crust and lithosphere. Subgroup coordinator: Walter Mooney Contributors Links Ekström Forsyth Helmberger Kind Laske CRUST1.0, A Global Crustal Model at 1x1 degrees Global Digital Sediment Map A Global Crustal Model at 2x2 degrees CRUST 5.1 (IGPP site) Levshin/Ritzwoller Eurasia regional model Antarctica regional model South America regional model Masters A Global Heatflow Map Mitchell Crustal/Upper Mantle Attenuation Mooney web site: CRUST 5.1 (USGS site) ftp site: CRUST 5.1 D. Müller Global Digital Age Map Nataf 3SMAC Sambridge RUM model Sandwell Global Topography Shearer If you would like to contribute, please contact Guy Masters ( gmasters@ucsd.edu)

Assembled Data Sets and Models

• Crustal/Upper Mantle Models
• Age Maps, Topography/Bathymetry
• Crustal/Upper Mantle Attenuation
• Surface Waves, Regional Models of the Lithosphere
• Body Waves, Regional Models of the Lithosphere
• Mantle Discontinuities
• Anisotropy

Crustal/Upper Mantle Attenuation This section is under construction. It will summarize subgroups of regional datasets and models of attenuation and provide the links to the corresponding web sites. Attenuation Data/Model 1 (e.g. Region 1) Attenuation Data/Model 2 (e.g. Region 2)

Regional Surface Wave Studies This section summarizes regional studies of surface waves. The data/models will be grouped by geographic region, as they become available on the world wide web. Region 1: Europe Region 2: Asia Region 3: North America Region 4: South America Region 5: Africa Region 6: Australia Region 7: Antarctica

Regional Teleseismic Studies This section is currently under construction. Its purpose will be to summarize results from regional teleseismic studies and provide the links to corresponding web pages as they become available. The data/models will be grouped by geographic region. Region 1: Europe Region 2: Asia Region 3: North America Region 4: South America Region 5: Africa Region 6: Australia Region 7: Antarctica

Mantle Discontinuities This section is currently under construction. Its purpose will be to summarize results from studies on mantle discontinuities and provide the links to corresponding web pages as they become available. The data/models will be grouped by depth. discontinuity 1: (e.g. 670km) discontinuity 2: (e.g. 410km) discontinuity 3: (e.g. D")

Anisotropy This section is currently under construction. Its purpose will be to summarize results from studies on transverse and azimuthal anisotropy. anisotropy topic 1: (e.g. global transverse isotropy)

Crust 2.0: A Global Crustal Model at 2° x 2° (Laske, Masters, Reif) CRUST 2.0 is a global crustal model that specifies density, compressional and shear velocity on a 2x2° grid. It is an updated version of CRUST 5.1. A total of 341 different crustal profiles describe the variations in the 16200 cells of the 2x2° grid. Types Thickness Sediment Thickness README Description of the model. The model and fortran routines to read the model are available on our anonymous ftp site.

Crust 5.1: A Global Crustal Model at 5° x 5° (Mooney, Laske, Masters) CRUST 5.1 is a global crustal model that specifies density, compressional and shear velocity on a 5x5° grid. A total of 149 different crustal profiles describe the variations in the 2952 cells of the 5x5° grid. Types Thickness Sediment Thickness README Descriptions of the model are available at both the IGPP and the USGS site. The model and fortran routines to read the model are available on our anonymous ftp site.

3SMAC (Nataf and Ricard) An a priori seismological model of the upper mantle based on geophysical modeling. Data are available on a 2x2° grid. A short description can be found in the REM abstract. The compressed tar file (available via anonymous ftp) includes the model and programs to read and plot it. click on the plot for a quick comparison of crustal thicknesses of 3SMAC with that of CRUST 5.0, the 1996 version of CRUST 5.1 ([Olivier Fehrenbach, 1996]).

RUM: Regionalized Upper Mantle (Gudmundsson and Sambridge) This section provides a link to the RUM model. RUM is a three-dimensional model of seismic structure which is described by only 90 parameters. This is achieved by irregularly sampling a detailed regionalization of the globel, by detailed mapping of subducted lithosphere in the mantle as defined by seismicity. click here for a quick view of the regionalization used. The link to the RUM web site provides the model and a detailed description.

A Global Digital Maps of Sediment Thickness (Laske and Masters) This section provides a link to a Global Digital Sediment Maps. This map is compiled on a 1x1° grid. Provided are the thickness map and elastic parameters (density, seismic velocities) with the same grid spacing. click here for a quick view. The link to the Global Digital Sediment Map web site provides the model and a detailed description.